Ecology

Which ecological method is being used if you set up the effect of different levels of sunlight on plant growth

• Observation

• Modeling

• Experimenting

• Questioning

A ______________ is a model of complex feeding interactions among organisms from producers to decomposers.

Compare and contrast autotroph and heterotroph.

Answer explanation

Autotrophs use raw materials in the environment to make their own food using either photosynthesis or chemosynthesis.

Heterotrophs must eat food because they cannot make their own.

What is the greenhouse effect?

• a natural phenomenon that maintains Earth's temperature range

• the result of the differences in the angle of the sun's rays

• an unusual phenomenon that causes heat energy to be radiated back into the atmosphere

• something that has only occurred in the last 50 years

Answer explanation

The greenhouse effect is a natural process caused by greenhouse gases being released into the atmosphere. Greenhouse gases accumulate in the atmosphere and more heat from the sunlight is trapped closer to the earth's surface. This maintains higher temperatures on earth, making it warm enough for life. However, in more recent years as greenhouse gas levels have risen, global temperatures are rising as part of global warming.

The 3 climate zones on earth are _________ closest to the equator, __________ in the middle, and ___________ furthest from the equator.

What is an organism's niche?

Answer explanation

The range of physical and biological conditions in which the organism lives and the way it obtains what it needs to survive and reproduce.

What are the differences between exponential and logistic growth?

Answer explanation

Exponential growth occurs under ideal conditions when there are unlimited resources. The population grows rapidly without stopping.

Logistic growth occurs when resources become limited. The population starts growing exponentially, the the growth slows, and eventually stops. The population eventually stabilizes at the carrying capacity?

Which of the following is an example of density independent limiting factor?

• disease

• emigration

• competition

• flooding

What is one of the greatest threats to biodiversity today?

What is 1 benefit of monoculture farming?

• The ability to spend less money on fertilizer

• The use of less water for irrigation

• Disease and pest resistance of the crops

• The ability to grow a lot of food